# -*- coding: utf-8 -*-
# @Time    : 2023/11/12
# @Author  : Yangyali
#
import sys
from time import sleep

import pygame

from settings import Settings
from ship import Ship
from bullet import Bullet
from alien import Alien
from game_stats import GameStats
from  button import Button
from scoreboard import Scoreboard
class AlienInvasion:
    """管理游戏资源和行为的类"""
    def __init__(self):
        """初始化游戏并创建游戏资源。"""
        pygame.init()
        self.settings=Settings()
        #设置屏幕主窗口 对象screen是一个surface。
        self.screen = pygame.display.set_mode((self.settings.screen_width, self.settings.screen_height))
        # 设置窗口的标题，即游戏名称
        pygame.display.set_caption("外星人入侵")
        #创建一个用于存储游戏统计信息的实例
        self.stats = GameStats(self)
        self.sb = Scoreboard(self)
        self.ship=Ship(self)
        self.bullets = pygame.sprite.Group()
        self.aliens = pygame.sprite.Group()

        self._create_fleet()
        self.play_button=Button(self,"Play")


    def _check_events(self):
        """响应按键和鼠标事件"""
        #循环获取事件，监听事件状态
        for event in pygame.event.get():
            #判断用户是否点击X关闭按钮，
            if event.type == pygame.QUIT:
                self.sb.restore_hight_score()
                #终止程序，确保退出程序
                sys.exit()
            elif event.type == pygame.KEYDOWN:
               self._check_keydown_events(event)
            elif event.type == pygame.KEYUP:
                self._check_keyup_events(event)
            elif event.type == pygame.MOUSEBUTTONDOWN:
                mouse_pos = pygame.mouse.get_pos()
                self._check_play_button(mouse_pos)

    def _check_play_button(self,mouse_pos):
        """在玩家单击play按钮时开始新游戏"""
        button_clicked = self.play_button.rect.collidepoint(mouse_pos)
        if button_clicked and not self.stats.game_active:
            self.settings.initialize_dynamic_settings()
            self.stats.reset_stats()
            self.stats.game_active = True
            #重置游戏统计信息
            self.sb.prep_score()
            self.sb.prep_level()
            # self.sb.prep_ships()

            #清空余下的外星人和子弹
            self.aliens.empty()
            self.bullets.empty()

            self._create_fleet()
            self.ship.center_ship()
            pygame.mouse.set_visible(False)

    def _check_keydown_events(self,event):
        """响应按键"""
        if event.key == pygame.K_RIGHT:
            # 向右移动飞船
            # self.ship.rect.x += 1
            self.ship.moving_right = True
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = True
        elif event.key == pygame.K_q:
            sys.exit()
        elif event.key == pygame.K_SPACE:
            self._fire_bullet()

    def _check_keyup_events(self,event):
        if event.key == pygame.K_RIGHT:
            # 向右移动飞船
            # self.ship.rect.x += 1
            self.ship.moving_right = False
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = False

    def _fire_bullet(self):
        """创建一颗子弹，将其计入编组bullets"""
        if len(self.bullets) < self.settings.bullets_allowed:
            new_bullet = Bullet(self)
            self.bullets.add(new_bullet)
    def _update_bullets(self):
        """更新子弹的位置并删除消失的子弹"""
        self.bullets.update()
        for bullet in self.bullets.copy():
            if bullet.rect.bottom <=0:
                self.bullets.remove(bullet)
        self._check_bullet_alien_collisions()



    def _create_fleet(self):
        """创建外星人群"""
        alien = Alien(self)
        alien_width,alien_height = alien.rect.size
        available_space_x = self.settings.screen_width -(2*alien_width)
        number_alien_x = available_space_x // (2*alien_width)
        #计算屏幕可容纳多少行外星人
        ship_height = self.ship.rect.height
        available_space_y = (self.settings.screen_height - (3*alien_height) -ship_height )
        number_rows =available_space_y // (2*alien_height)
        #创建外星人群
        for row_number in range(number_rows):
            for alien_number in range(number_alien_x):
                self._create_alien(alien_number,row_number)

    def _create_alien(self,alien_number,row_number):
        """创建外星人"""
        alien = Alien(self)
        alien_width,alien_height = alien.rect.size
        alien.x = alien_width + 2 * alien_width * alien_number
        alien.rect.x = alien.x
        alien.rect.y = alien.rect.height + 2*alien.rect.height *row_number
        self.aliens.add(alien)

    def _update_screen(self):
        """更新屏幕上的图像，并切换到新屏幕"""
        self.screen.fill(self.settings.bg_color)

        self.ship.blitme()
        for bullet in self.bullets.sprites():
            bullet.draw_bullet()


        for bullet in self.bullets.sprites():
            bullet.draw_bullet()
        self.aliens.draw(self.screen)
        #显示得分
        self.sb.show_score()
        #如果游戏处于非活动状态，就绘制play按钮
        if not self.stats.game_active:
            self.play_button.draw_button()
        #让绘制可
        pygame.display.flip()

    def _update_aliens(self):
        """检查是否有外星人位于屏幕边缘，并更新整群外星人的位置"""
        self._check_fleet_edges()
        self.aliens.update()
        #检测外星人和飞船之间的碰撞
        if pygame.sprite.spritecollideany(self.ship,self.aliens):
            self._ship_hit()
        self._check_aliens_bottom()



    def _check_fleet_edges(self):
        """有外星人到达边缘时采取相应的措施"""
        for alien in self.aliens.sprites():
            if alien.check_edges():
                self._change_fleet_direction()
                break
    def _change_fleet_direction(self):
        """将整群外星人下移，并改变它们的方向"""
        for alien in self.aliens.sprites():
            alien.rect.y +=self.settings.fleet_drop_speed
        self.settings.fleet_direction *=-1

    def _ship_hit(self):
        """响应飞船被外星人撞到"""
        #将ship+left减1
        if self.stats.ships_left > 0: #飞船数量大于0
            self.stats.ships_left-=1
            # self.sb.prep_ships()
        #清空yuxiang的外星人和子弹
            self.aliens.empty()
            self.bullets.empty()

            self._create_fleet()
            self.ship.center_ship()
            sleep(0.5)
        else:
            self.stats.game_active = False #没有飞船了，设置为False
            pygame.mouse.set_visible(True)
    def _check_aliens_bottom(self):
        """检查是否有外星人到达屏幕底端"""
        screen_rect = self.screen.get_rect()
        for alien in self.aliens.sprites():
            if alien.rect.bottom >=screen_rect.bottom:
                self._ship_hit()
                break


    def run_game(self):
        """开始游戏的主循环"""
        while True:
            # 监视键盘和鼠标事件。
            self._check_events()
            #当游戏为活动时
            if self.stats.game_active:
                self.ship.update()
                self._update_bullets()
                # print(len(self.bullets))
                self._update_aliens()
            self._update_screen()

    def _check_bullet_alien_collisions(self):
        """响应子弹和外星人碰撞"""
        #删除发生碰撞的子弹和外星人
        collections = pygame.sprite.groupcollide(self.bullets, self.aliens, True, True)

        if collections:
            for aliens in collections.values():
                self.stats.score +=self.settings.alien_points * len(aliens)
            self.sb.prep_score()
            self.sb.check_high_score()
        if not self.aliens:
            # 删除现有的子弹并创建一群外星人
            self.bullets.empty()
            self._create_fleet()
            self.settings.increase_speed()

            #提高等级
            self.stats.level +=1
            print(f"等级为{self.stats.level}")
            self.sb.prep_level()
if __name__ == '__main__':
 # 创建游戏实例并运行游戏。
 ai = AlienInvasion()
 ai.run_game()